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Astron. Astrophys. 335, L73-L76 (1998)

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Letter to the Editor

The role of the f-mode in the relation between solar intensity oscillations and granulation

M. Kiefer 1 and H. Balthasar 2

1 Kiepenheuer-Institut für Sonnenphysik, Schöneckstrasse 6, D-79104 Freiburg, Germany (e-mail: kiefer@kis.uni-freiburg.de)
2 Astrophysikalisches Institut Potsdam, Telegrafenberg, D-14473 Potsdam, Germany (e-mail: hbalthasar@aip.de)

Received 23 February 1998 / Accepted 22 May 1998


A series of white-light images is used to examine the relation of solar intensity oscillations and the granulation structure. Much of the oscillation power lies on the f-mode ridge in the diagnostic diagram. Filters are constructed to separate granulation, p-modes, and the f-mode. The filtered data are used to investigate the relation between rms-amplitudes of the oscillations and the granulation structure. Both p-modes and f-mode show a tendency to increased amplitudes in the darkest features of the granulation structure, with the f-mode showing this preference for dark regions much clearer. We emphasize that due to the different propagation characteristics of p-modes and the f-mode a separation like ours is mandatory to draw conclusions about wave excitation and diffraction.

Key words: Sun: granulation – Sun: oscillations

Send offprint requests to: M. Kiefer

© European Southern Observatory (ESO) 1998

Online publication: June 26, 1998